Allen-Bradley 1756-L84E ControlLogix – Ready to Ship / Pick Up
In stock: 1756-L84E 20 MB ControlLogix 5580 controller, embedded 1 Gb EtherNet/IP port. NJT Automation has 3 units available in Milwaukee, WI, ready to ship or available for local pickup. Includes a one-year full-function warranty.
$4,499.99 – $4,899.99USD
| Part Number | 1756-L84E |
| Description | ControlLogix 5580 controller, 20 MB. In stock in unused surplus condition, Series B. |
| Shipping | Ships today UPS Ground included | Next-Day Air and Worldwide Shipping available at checkout |
| Pickup | Free local pickup at 2122 N Prospect Ave. Call ahead at (414) 331-5954. |
| Warranty | 1-year full-function warranty provided by NJT Automation. Warranty details
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| Returns | 90-day free returns. View return policy |
| Exchange | Send us your defective 1756-L84E after your purchase for a 10% core credit ($450 – $490). We also purchase old or damaged parts outright. |
Replacement Options for 1756-L84E
In stock and ready to ship today
| Availability | Multiple Options Available | ||||||||||||||||||||||||||||||
| Variants | Part NumberConditionSeriesQtyPrice 1756-L84E /BUnused surplus (new old stock)Series B1$4,499.99 USD1756-L84ES /BUnused surplus (new old stock)Series B2$4,899.99 USD | ||||||||||||||||||||||||||||||
| Repairs | 1756-L84E Mail-In Repair ServiceEstimated: $1,440.00 | ||||||||||||||||||||||||||||||
Part Number Decoder | ControlLogix 5580 controller 1756L84E 20 MB ControlLogix 5580 controller, embedded 1 Gb EtherNet/IP port.
Decoded from the Rockwell Automation catalog-number structure. Series and firmware revision are printed on the product label, not encoded here. | ||||||||||||||||||||||||||||||
Physical Data | Weight and DimensionsWeight0.87 lb (0.39 kg)H × W × D5.7 × 1.4 × 5.7 in. (145 × 35 × 145 mm)
Product weight and dimensions are typical manufacturer-published values and may differ by series or option. Shipping box and weight are estimates for freight planning; the packed unit may ship in a different box. | ||||||||||||||||||||||||||||||
Datasheet | Datasheet available for download Generated from product specifications; not an official Allen-Bradley datasheet. For an official datasheet, contact Allen-Bradley or an authorized distributor. | ||||||||||||||||||||||||||||||
Similar Part Numbers | |||||||||||||||||||||||||||||||
Allen Bradley Information | Technical Description 20 MB ControlLogix 5580 controller, embedded 1 Gb EtherNet/IP port. Lifecycle: Active. Verify current status with the manufacturer. Technical Specifications15 parameters from manufacturer-published specifications
Typical manufacturer-published values for this catalog number; confirm against the current manufacturer documentation before specifying. | ||||||||||||||||||||||||||||||
Alternate Part Numbers | 1756L84E | ||||||||||||||||||||||||||||||
| Category | ControlLogix | ||||||||||||||||||||||||||||||
| Part Number | 1756-L84E | ||||||||||||||||||||||||||||||
| Manufacturer | Allen-Bradley | ||||||||||||||||||||||||||||||
Previously sold 1756-L84E6 sold
NJT Automation has supplied and shipped 6 1756-L84E ControlLogix 5580 controllers since 2024; these listings are sold and the in-stock options above are ready to ship.
- Sold
- 6 since 2024
- Price range
- $2,600 – $4,500, median $3,000
- By condition
- Unused surplus (4)$3,000 – $4,500Used (2)$2,600 – $3,000
- Series
- B × 6
Typical sold price for a 1756-L84E: used around $2,800 and unused surplus around $3,500.
Can the 1756-L84E be repaired?
Yes. NJT Automation offers mail-in repair for the 1756-L84E, including diagnostic evaluation, component-level repair, and functional testing.
NJT Managed Repair
One vendor. One warranty. NJT manages the entire process.
- 1-year full-function NJT warranty, with 2- and 3-year options available
- Rush service available for production-critical repairs
- No evaluation or diagnostic charges
- No repair, no charge
- "Unrepairable" is not an option
- Pre-paid UPS shipping label provided for sending your unit in
- $650 minimum repair charge, shipping included both ways
Looking for another option? For lower-cost repairs or if you prefer to work directly with an independent repair specialist, compare bids through RepairMode. RepairMode providers operate independently and set their own pricing and warranty terms.
Find a PLC repair specialiston RepairMode.com ↗Common 1756-L84E failures
Failure patterns we regularly see on ControlLogix 5580 controller hardware like the 1756-L84E:
- Four-character status display stuck, blank or showing scrolling fault text
- Overheating in a full chassis, especially with no spacing in sealed enclosures
- Repeated major faults after a firmware flash that did not complete
- Controller will not boot or shows a solid red OK LED (nonrecoverable major fault) after a power event
- SD card corruption: controller reports a load failure or comes up with no project
Repair or replace?
ReplaceReplace the 1756-L84E if it will not boot, shows a solid red fault light, or has lost its program. Another ControlLogix 5580 controller takes the same program: download it, match the firmware, and the line is running again. Stick with the exact 1756-L84E. The suffix sets the 20 MB memory, so a near match is a different unit. We have the 1756-L84E in stock. Order before 5:00 PM Central and it ships the same day.
RepairRepair the 1756-L84E when the fault is in the power section, a port or the status display rather than the processor core, or when the controller carries a firmware revision or validated project you cannot easily re-flash onto a different unit. Most 1756-L84E units reach our bench with one of two symptoms: “SD card corruption” or “Front USB and 1-Gb Ethernet port failures”. Already swapped it out? Repairing the failed 1756-L84E turns it into a tested spare on the shelf for the next failure. Our estimated $1,440.00 repair of the 1756-L84E includes full-function testing and a 1-year warranty.
Request a Repair Quote
Text photos of the faulty unit and the symptoms to (414) 331-5954.
All product photos were taken by NJT Automation. Test videos originated from either NJT Automation internally or from repair technicians within our network.
Still have questions?
Find answers to shipping, warranties, repairs, and more.
Frequently Asked Questions
What is the 1756-L84E?
The Allen-Bradley 1756-L84E is a 20 MB ControlLogix 5580 controller, embedded 1 Gb EtherNet/IP port.
What condition is the 1756-L84E in?
NJT Automation currently has 3 units of the 1756-L84E in stock in unused surplus condition (Series B). Each listing states its own condition and series. We can quote this part in unused surplus, refurbished, or used condition depending on availability and your preference. Specify your requirement in the RFQ.
How much does the 1756-L84E cost?
At NJT Automation, 6 1756-L84E ControlLogix 5580 controllers have sold since 2024 for $2,600 – $4,500, with a median of $3,000. By condition, used ControlLogix 5580 controllers went for $2,600 – $3,000 and unused surplus ControlLogix 5580 controllers went for $3,000 – $4,500. Right now 3 units are in stock at $4,500 to $4,900, depending on condition and series.
When does this part ship?
NJT Automation has 3 units of the 1756-L84E ControlLogix 5580 controller on the shelf in Milwaukee, WI, priced from $4,499.99 to $4,899.99. Orders placed before 5:00 PM Central on business days ship the same day; orders placed after the cutoff ship the next business day.
Can you ship this next-day air?
Yes. UPS Next Day Air is available at checkout for the 1756-L84E ControlLogix 5580 controller. Place your order before 5:00 PM Central on a business day and your in-stock item ships the same day for next-business-day delivery.
Can I pick this item up locally?
Yes. Free local pickup is available for the 3 in-stock 1756-L84E units at NJT Automation, 2122 N Prospect Ave, Milwaukee, WI, during business hours. Contact us to arrange a pickup time.
How much memory does the 1756-L84E have?
20 MB of standard user memory.